Motion converter



Sept. 16, 1952. Q DUNLAP 2,610,510

- MOTION CONVERTER Filed Jan. 7 1950 Patented Sept. 16, 1952 MOTION CONVERTER Ollen L. Dunlap, Long Beach, Calif.

Application January 7, 1950, Serial No. 137,415

Claims.

This invention relates 'to a motion converter whereby a shaft is reciprocated by'the a'ction of an eccentrically positioned linkwhich engages the rotating shaft on which the motion converter is mounted. Y

An object of my invention is to motion converter in which the link which serves to reciprocate the shaft is moved to an eccentric position in a novel and effective manner.

Still another object of my invention is to provide a novel means of mounting the piston on the rotating shaft so that the piston will not rotate with the shaft.

Still another object of my invention is to providea novel means of shifting the link by means of a hydraulically operated piston.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

In the drawing:

I Figure 1 is a top plan view of my motion converter,

Figure 2 is a sectional view taken on line 2 -2 of Figure 1.

Figure 3 is a fragmentary side elevation taken from the line 33 of Figure 1.

Figure 4 is a transverse sectional view taken on line 44 of Figure 3.

Referring more particularly to the drawing, thenumeral I indicates a cylinder, comprising a cup-shaped end 2, and a lower end 3, closing the ends of said cylinder. A piston 4 is reciprocally mounted in the cylinder I, and this piston is mounted on a shaft 5, which extends through the cylinder I and the ends 2-3. This shaft is continuously rotated from a suitable source of power, not shown. Suitable packing glands E and I are providedin the ends 2+3, respectively, and

shaft 5, or is fixedly attached to this shaft, and

thisgshoulder is positioned within the piston 4, as shown. A thrustbearing 9'is provided on each side of the shoulder 8, thus providing an antifriction bearing between the shoulder 8 and the piston 4, thus permitting the piston t to remain stationary while the shaft 5 is rotating. A plate Ill is-fixedly secured to the upper end of the shaft 5 and is positioned within the cup 2, substantially as shown. A shiftable stirrup II is pivotally secured to the cup 2, by means of the pins I2-I 3.

Alink I4 is secured to the plate It by means of the ball joint I5, and to the stirrup I I by means provide a novel of the ball joint I6. These ball joints can be universal joints, if desired. Aslong as the joint I 6 is in axial alignment of the shaftlB, there will be reciprocating movement of this shaft, however,

if'the joint I6 is eccentric to the centerline'of the shaft 5 (as shown in Figure l) thenthe'shaft 5 will be reciprocated, and the amount of-reciprocation will be determined by the amount of eccentricity of the joint I6, fromthe center line oftheshaft5.

The stirrup I I may be provided with oppositely positioned-fingers II-IB, and the finger I! is engaged by a spring pressed plunger I9, while the finger I8 is engaged by the hydraulically actuated piston 20. Thus, by applying hydraulic pressure to the piston 20, it is possible to shift the stirrup l I, as desired, and the amount of tilt of the stirrup l I will determine the stroke of the piston 4.

In operation, the shaft 5 is continuously r0- tated by a suitable motor. The eccentrically positioned link I4 will reciprocate the shaft 5 and l the piston 4 within the cylinder I. Suitable fluid ports, which are usual and well known in the art,

enable fluid to pass into and out of the cylinder I, v

and these fluids are pumped by the piston 4, in the usual and well known manner. I By controlling fluid pressure on the piston 20, it is possible to tilt the stirrup I I, as desired, while the pump is in action.

Having described my invention, I claim:

1.'A motion converter comprising a cylinder, a shaft extending axially through the cylinder, means journalling the shaft in the cylinder, means to continuously rotate said shaft, a plate on the outer end of the shaft, a stirrup, means pivotally mounting the stirrup on one end of said cylinder, a link journalled in said stirrup and said plate, said link being eccentrically positioned relative to the center line of said shaft, and hydraulically actuated means engaging said stirrup'to tilt the same relative to the center line of said shaft. l

2. A motion converter comprising a cylinder, a shaft extending axially through the cylinder, means I journalling the shaft in the cylinder,

-means to continuously rotate said shaft, a plate on the outer end of the shaft, a stirrup, means pivotally mounting the stirrup on one end of said cylinder, a link journalled in said stirrup and said plate, said link being eccentrically positioned relative to the center line of said shaft, and hydraulically actuated means engaging said stirrup to tilt the same relative to the center line of said shaft, and a spring engaging the stirrup and opposing the pressure of said hydraulic piston.

3. A motion converter comprising a cylinder, a shaft extending axially through the cylinder, means journalling the shaft in the cylinder, means to continuously rotate said shaft, a plate fixedly mounted on one end of said shaft, a stir rup pivotally mounted on one end of said cylinder and adjacent the plate, a link journalled in said stirrup and-saidplate; said 1ink'tieing-eccentrical- 1y positionefrelative to the center line 'of "said shaft, oppositely projecting fingers extending from the stirrup and means engaging one "of said fingers to tilt the stirrup relative :toathe: center line of said shaft.

4. A motion converter comprising'a' 'cylinder;

a shaft extending axially through .thecylindern means journalling the shaft in the cylinder, means to continuously rotate said shaft,=--a*plate fixedly mounted on 0113:6116. of said shaft, a stiri'unzpivotaily mounteds'on one .-:end:-ofr1said;cy1indemand adjacent 13118711113118}: azlinkwjournalled. in said.-.stirrup ::and said; plate; :said 1 linkzbeing; Leccentricallyi-ipositi'oned'. relativerto :thewenter line oft-said shaft; oppositelyrproj ectingfingers extendingafrom- =.th'e stirrupand means engagingmne'iof saidlfingers tootiltthe stirrup relative to the center line-for. said shaft andspringimeans engagingzthe other: finger: and opposing the; pressure ofthe means engaging the first named fingerr of .asaid" shaft, "oppositely projecting fingers extendin'gfrom the stirrup; and hydraulically actuated means engaging one of said fingers to tilt the stirrup relative to the center line .of said shaft OLLEN L. DUNLAP.

REFERENCES CITED The following references are of record in the "file df this patent:

UNITED STATES PATENTS Number Name Date 2,369,345. Folke i.Eeb. 13, 19 5 2,436,492; Shephard Feb? 2&1; 1948 2,436,493 Shephard Feb. 24, 1948 FOREIGN I PATENTS Number Country Date 116;462' Germany Dec. 27,1900 

